用“underground railroad”造句大全，underground railroad造句
Harriet Tubman, another great woman, led hundreds of American slaves to free-dom along the underground railroad, risking her life over and over again to bring her fellow slaves to freedom.
In 2004 a center in honor of the 'underground railroad' opens in Cincinnati.
Negro slaves took great chances to escape to freedom. Many gained their freedom through the so-called "underground railroad."
